DHCP connection failed

This is a known issue with some Asus routers. Try this:

On the router setup, go the WAN tab, then look for "DHCP query frequency", near the bottom. Change it to "Continuous mode".

Does that help?

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@Tech_User1 wrote:

I just got a new router (ASUS RT-AX86U AX5700) I changed the xfinity modem to be on bridge mode. But when I open the Asus portal it tells me "DHCP Failure" please help.

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Did you power-cycle the Xfinity gateway device after placing it in to bridge mode and connecting the Asus router to it ?